Ments



No. 27,054. Patented :une 1s, |899.

UWLEMAN.

ELEGTBBCAL BUBGLAR ALARM SYSTEM.

(Application filed Oct, 18, `1897.)

` 3 Sheets-Sheet I,'

o Model.)

No. 627,054. Patenten lune ls, |899.

. c. QULEMAN.

ELECTRICAL BURGLAR ALARM SYSTEM.

(Application filed Oct. 18, 1897.) (No Model.) 3 Sheets-Sheet 2.

Paante June E3. 218%.

EILEMAN. ELECTRICAL BUEGLAR ALARM Sm.

(Application led Oct. 18, 1897.)

3 Sheets-Sheet 3.

No Model.)

3 5 shunt.

imitan drains Parent Ottica@ CLYDE COLEMAN, OF CHICAGO, ILLINOIS, AtiSIGNOR, BY MESNE 4-ASSIGN- MENTS, OF TWO-THIRDS TO TIIEvBANKlCRS ELECTRIC lPROTECTIVE COMPANY, OF SAME PLACE.

'etto-raient ennemie-ALARM ever-san.

SPECIFtcATIoN forming part of Letters )Patent No. 627,054, dated June, 13, ieee.

Application filed otober. l8. 1897. Serial No. 655,526. (No model.)

To tI/Z whom, it may concern.' l

Bc it known that I, CLYDE COLEMAN, a citizen of the United States, residing at Chicago,

in the county of Cook and State of Illinois,

5 have invented certain new and usefu-l Improvements in Electrical Burglar-AlarmSystems, of which the following is a specification.

The present invention relates -to that class of burglar-alarm systems which have a closed ro main or controlling circuit, a balanced relay or galvanometcr or some other electrical applicance which will respond to variations in the current passing through the controllingcircuit, all such appliances being comprehended Iby the term responsive device as used in this specification, and an alarm mechanism which is under thev cont-rol ofthe responsive device. o

One part of the invention relates to a syszVo/.tem of the .class described in which there is provision for permitting the door of the guarded structure to be open during business hours, while at the same time the main eircuitis kept closed and the current on, to the end that current may be kept on the main circuitand on 3o for the current of the main circuit. One includes the contacts that are controlled by thedoor and is herein called the door-circuit, and they other passes around or shunts the door-contacts and is herein called the* door- The term door-circuit as used in this specification is intended to comprehend a circuit or circuits or part of a cir'cnit in which the contacts which are controlled by the door or window or screen or curtain or any ,to other` closure or device for closing au opening to the guarded structure are located .regardless of whether any part of this circuit or its contacts are, actually mounted upon andcarried by the door or not, albeit in the preferred form of the invention the door-circuit and some of its contacts are, in fact, carried by the door. The term door-shunt as used'n this specification is intended to comprehend any path, of whatever character, through which 5o the current of the in aiaeircuit may pass with-` In such a systemV would be given.

out passing through the door-circuit, to` the end that current may be left on the main circuit or a portion of it and on the responsive device and the latter be kept normal during businessho'urs,when thedoorisopen. Means `are provided whereby the main circuit may be completed through either or both of these two paths under the .conditions hereinafter described without V`causing an alarm to be sounded. The lneans for switching the current from the door-shunt to the door-circuit may include an exposed push-button or switch adapted to be operated man ually; but the means for switching the current from the door-circuit to the door-shunt is preferably disposed within the guarded structure, so as to be inaccessible, is automatic in its opera-v tion, and is so conditioned that it will switch the current only at the commencement of4 business hours, when the door ofthe guarded structure is to be opened. In a system of this description should the door be opened before the door-shunt is completed the responsive device would be nuenced and an alarm given, and should the door-circuit not be completed by the act of closing the door, either because of the presence of dirt or corrosion at the contacts or from any other cause and the operator should 4manually open the door-shunt, the

main circuit would be opened, the responsive device would be influenced, and an alarm To avoid this, according to the present invention means'for indicating the conditions of the door-circuit and doorshunt areprovided.

One object of the invention is to provide vmeans for indicating during the day, when the door-circuit is open, `the condition of thc system, so that any variation of it from nor- .mal may be detected and remedied before the system is adjusted for the night. This object I accomplish by the use of an indicator ,sograduated that it will show all variationsv in the condition ofthe circuit; Preferably this indicator is located at the guarded struc'- ture, and preferably also its coils are included in the doonshiint, the advantage oilY this arrangement fbeing th'at one and thesame in-A strument may be `used, for giving all the indications above desctihedf-that is to say, dure senese ing business hours, when the door-circuit is open and thecurrent is passing through the door-shunt, the indicator will show the conydition of the system, when the door is 'closed takes to open the shunt, so that the main circuit will be complete only through the doorcircuit, the indicator will show whether or not the shunt is, in fact, opened.

The invention relates in part also to `the means for automaticallycontrollin g the door shunt, and the object of this part of the invention is to provide a simple aiid eifective device which may be operated manually for opening the door-shunt and which i'vill operate automatically for closing the door-shunt. This object I accoinplish'by/the useof the mechanism hereinatterfully described.

Another part of the inventionrelates more particularly to that class of systems in which the alarm devices are disposed in a protected housing lwhich is located at the alarm-station, by which is meant thelplace where the alarm is given,or where the alarmestation itself is so disposed as to be not conveniently accessible. This protected housing may be located in an exposed place, or it may be located at a police or other station, or in an chce, or at some other place external to the guarded structure, or even Wit-hin the guarded structure itself. Nhere the alarm mechanism is located at a police or other station, if no means be provided to prevent it it would be possible for persons having authorized admittance to the station to in some way cripple the alarm mechanism, sov that even upon a surreptitious disturbance of the system an alarm willA not be given, and inorder to avoidl this it is desirable, even where the alarm mechanism is, as aforesaid, located at a station where a watchman is in attendance, to: have the alarm mechanism disposed Within a' protected housing to which entrance cannot be had without giving an alarm. This is notv new per se, and so far as my present inven tion relates to a system of this class its object is to provide means whereby the alar'm mech-3 anism,and especially the battery the1'eof,when the battery is located Within the .protected housing, maybe testedfrom the guarded.

structure end of the system, oi at least from a point outside ofthe protected housing itself. This object I accomplish by the-usent a testcircuit, which extends from Within .the protected housingftoa point outside of the same and is provided with means for electrically' connecting the alarm circuit therewith, a suitable device being connected with the testcircuit, and preferably located at the .guarded structure,` for indicating the condition of the alarm-circuit. For thispnrpose I prefer to use agalvanometer; but any other instrument which W1ll give the desired indication is within the scope ofV my invention, 'and hence in interpreting this speciiication and they. claims this term galvanometei" is not to he con; strued in a strict sense, but, on 'the contrary,

it is to be construed as comprehending and f in operation, even though the main or controlling circnit be restored to normal condition, and this object I accomplish by providf ing the alarm-circuit with a loop which shunts the contacts that are under the control of the responsive device and which is itself pre vided with contacts that are closed 'when electromagnet disposed in the alarm-circuit is energized.

The invention 'consists in the features of novelty that are herein described, and in order that it may be more fully understood i will describe it'with" reference to the acccinj partying drawings, which are made a part et this specification, and in Which- Figure l is a diagrammatic represcntaticn of a burglar-alarm system embodying the vention in. its preferred form. diagrammatic representation ot' the parts thereof that are located at the guarded struc ture. Fig. 3is a'fdiagrammatic representation of the parts thereof that are located at the alarm-station. Figs. i? and diiier from Fig. l only in that they show the disposition of the several parts more in detail. ei, d, and 5 are diagram matic representations oi" the alarm-circuit and its accessories and oi means differing from each other and from ttf means shown in the preceding figures for testing it.' 'Fig 6 is an elevation oi the means for controlling the door-shunt. 6 a detail View showing the mercuryT device, here inafter described, for opening and closing one :z

of the circuits. Fig. 7 is a perspective View of a casing or covering for inclcsing an elec-- tric conductor or conductors. Fig. S isua transverse section thereof. Fig. Si is a lon gitudinal section thereof. iigd() is a di grammatic representation of the casing er covering included in' a burglar-alarm system such as is shown in Fig. l.

The line X may represent the guarded structure, which term is int/ended to compre ent afordstidmith an electrical barrier, which isdiagrammatically represented a i A A',

Fig. 2 is a .fz

Ego

caracte disposed that access cannot be had to the inte@ rior of the housing without causing an alarm to be given. The housing is preferablyconstructed ot' sheet-steel and is grounded, as shown at 7j, so that if itis penetrated by a metallic instrument and either of theY two sides A A' of the barrier is thereby electricallyrconnected with it a short circuit will result, causing an alarm. This housing may be located at a police or other station or oliiee distant from the guarded structure, or it maybe located adjacent to or within the guarded structure itself, the requirements of the invention being answered if it be so located that the alarm when given will be heard by some one. The guarded structure also is provided with an electrical barrier7 which may be of the construction described in the patent aforesaid or of any other desired construction. Itis represented diagrammatically'at l l' I) b', the portions l) h being disposed upon the door of the structure, (represented diagrammaticallyby the linefr,) while the portions 13B are disposed over the other parts of the struct ure. These Rbarri-ers'at the protected housing and guarded structure are electrically connected with the main or cont-rolling circuit C C C" C', in which are included also a resistance D and rheosta-t D', located at the guarded structure, and the coils of a responsive device E, located within the protected housing. At the guarded struct-ure the main circuit has a loopor loops c c, which include the contacts fr', .that are controlled by the door, and this portion or these portions of-the circuit, which also include the` portions i) h of the barrier, are herein termed the door-circuit.7 When the door is closed and its contacts c" are in proper condition, the main circuit will be completed through the door `circuit. The main circuit has also at the guarded structure a loop or loops C2 C3, which shunt the doorcircuit, (which loop or loops are herein called the door-shunt,) so that when the door-circuit is open and the door-shuntV is closed the main -circuit will be completed through the doorshunt. The loops C2 @3a-re provided with terminals or contacts c2 c3, which are under the control of a device F for making and breakingthecircuit-atthesepoints. Asshown more clearly in Figs'. 6 and (5, this device may consist of a rock-shaft f, carrying cups f',

each of which contains a drop of mercuryand into cachot which one pair of terminals extends, the arrangement being such that when the rock-shaft is at one extremity of its movement the mei'cu-rywill connectthe terminals, and when at the other extremity of its movement the mercury Will be out of contact with the terminals and leave them disconnected. This rock-shaft is provided with a 4tumbler or counterbalancefg, which will hold ateither extremity ot' its permitted movement until it 'is moved therefrom byaforee. For moving itin'onedirection-'i'. c., the direction which closes the shunt-I provide a chronometer or timepiece G, which, like a time-lock, may be set tc'run shaft, and to include this magnet in a local f circuit Il', having a battery H2 and an ex posed device ll, which is adapted tebe manu ally operated for the purpose of closing the circuit. lVhen this device is operated. and the circuit closed, the magnet will attract the arim-l'turcand move the rock-shaft to such position that the shunt will he opened- The door-shunt includes the coils l' of an indicator I, and this indicator is of such a character that it will give the indications above described. with a needle or pointer i', (preferably e);- posed) which sweeps a scale i1, (preferably exposeth) so graduated and marked that during the day, when the circuit is complete through the shunt and the door of the guarded structure is open,the indicator will show upon a graduated part ot' the scale the condition of the circuit-that is to say, it will show whether t-hc resistance in circuit is normal or not. It thc indicator shows only a slight variation from normal, indicatingr a slight leakage at some point, the error may be corrected by properly adjusting the rheostat D', and if a greater variation is indicated other means must be taken to locate and correct it. The scale isalso provided with a mark to which the needle will move when the main circuit is complete through bo'th the door-circuit and` through the shunt. At the time of closing the door of the guarded structure should the pointez' not'come upto this mark it will indicate that the contacts of the door-circuit are not in proper order, and this defect or obstruction should be removed before the current is thrown oft' of the shunt for the night. If the indicator gives the indication that the door-.circuit is in full electrical connection with' the main circuit, then the operator pushes thepush-button h3 for the purpose of throwing the current olf of the shuntin the manner alreadydescribed. 'If this result folloWs-L'. if the current is thrown oft' of the shunt by the act of pushing the button-the pointer moves toa mark on the scale, indicat ing' the fact.` lf the pointer does not move to this mark, the operator knows that the shunt has not been opened, and '.his defect must be remedied before the structure is finally closed for the night. Thus this one indicator is 'lo this cud it is provided IIO Iig

made to indicate these variousconditions ot' the door-circuit and door-shunt.

I prefer to make the two paths or loops of the main circuit of equal resistance,to the end trel point, accordingly as ell or none of the current is passing through that loop which includes the Windingsof the indicator. To this end i include in the door-circuit a suit -eble resistance, as shown et c'-.

in this specification the main circuit is said to have a. shunt around the door-circuit; but l desire to have it understood that in its brood-- est aspect the invention is not limited to a shuu't, strictly so celled, but includes any peth through which the mein circuit may be' completed withoutincludiug the door-circuit, to the end'that current may be left on the mein circuit on theresponsivedeviee during, the dey, Wheii thel door is opeu, so long as this auxiliary pethisof such a, character that it will maintain theresp'onsive device in normal condition. l A

The alarm-circuit J liras its own individual battery J', located within the protected housing Y, sind includes a switch J2, am electromagnet Ja, the needle or some other movable port of the responsive device E, and contacts .J 4,1'ocated in the path of seid needle and upon opposite sides thereof. The switch J2 is under' the inuence of e spring, e weight, or gravity, by `which it is held normally closed While the slome-circuit is in normal condition. The :iler-in device pro er is shown at K. ltmey 'he of any desiregchoreeter, and in thel drawings l heve'eh "wn. e bellwith spring mechanism for ringing-it, seid mechanism being'under the control of e, detect EL', which is y ceri-ieri hy theermetnre 550i the elect-romagn-.et J5... This arrangement is such that es soon es the cleric-circuit is completed et the responsive' device E the srmoture J5 will. be corrected end `the'detent K will release the mechanism for ringing the bell, eiter which the hell will continue to ring until seid mechonisni hes run down or until Vthe detect1 K egein engegee it. in order'. to prevent this rengegernent of the detect l', and thereby permit the sounding of the hierin to he continued for e considerable length of time, not withstanding the return of the responsive device E to normal condition, the ztlsrm-cirmit is provided with c inte .r if, which shunts-the movable part of the responsive derice E sndthe contziots J4. y rlhis shunt in-v cludes es c part of it the ermeture J5 or e peut corrieri thereby, which is adopted to ineke contact at J7 and vclose the shunt es soon :is theormeture is drawn down. vlWhen this toire place, the current will continue to iiow fromthe battery'J through the magnet J5, .through J7 to the 'armature J5, through the termeture to the wire J6, and beck to the mein Wire J, through which it is returned'to the battery.

As before stated, it is desirable to have the entire alarm mechanism included Within o protected housing, so that access cannot be had to it Without giving en oleron, end with this arrangement it is also desirable to pro vide ineens whereby `the condition of the che f Vanometer or other indice..,iorif'r loceted et the (preferably the guarded struct@ vide .means whereby the curr caused to pass through the elernrcireoit en through the gclvanometcr with clerm to be given. ln the dr; shown four different srrzinggeme thisobject can'be zrcco1nplishef v erregement being that shown in v:ind 3. in this preferred erreur j to the galvonometer L", cud.

ing from the gelvauoineter bool. When it is desired to test the cli tery, the switch L5 is moved. from the c-:uitect C5 to the contact L6. This opens the ine-in circuit and causes the needle of sive device E to cloee the alerniwri recit et one or the other of the contacts J4, end in order to prevent this from causing en "lerm to be given the .alarm-circuit is opened-e -e switchy J2, which is under the control or" located in a, circuit,herein cell ingoirouit. Thisswitchwk up of a. Wire C5, leading fr battery C4, the switch L5, Wire L, leading to the ins wire lill, l,eediogirom m battery.. Thus it will he @i @sud the switch 'h5 imein circuitend the` switch L5 is oo the eo ingcirccit will he cY "ou ,ergized, oud the jso thst the sizunltene: circuit et the respons :vented from giving en alarm. of the alarm-battery will needle of the responsive dori ccriieot Tl", Iwire L', galvenometer L4, L, und erlernt circuit J' bock to the battery, id in 'this way a, reading may be ou gelvenome ter L4', showing the condition of the elcrnr battery. It is true that in this condition of the system the magnet J3 is energized, but by reason of the high resistimce of the entire circuit and especially of the geivenoineter l the armature J 5. will not' be attracted. With this arron gement While the test is 'being mede the protective portion of the system is thrown oli". This is not e serious objection, however, since it requires only e, moment teoriche the test, but it may, if desired, be rtvoided by avoiding the use of any part ci the rn cleric, mechsnism 'mcy be tested from the cotresponsivedevica) or the testing-circuit may the switching testing-circuit with the two y -made one or more of the superimposed conresponsive device which is electrically cofr-` Acuit is normally open, (and this is preferable,

Aand 9.

test. In this case the testing-circuit may be so connected with the alarm-circuit that when the testing-circuit is closed the two will form practically one circuit, in which the vgalvanoineter at the guarded structure and the contacts J4 and needle of the responsive device at the alarm-station are arranged in m ultiple, or if only the battery of the alarm mechanism is to be tested I may use an entirely separate circuit connected with its poles and extending to the guarded structure and there provided with a galvanometer and a device `tor closing the circuit, Vas shown in Fig. 4, In Fig. 5, Z Z' represent the testing-circuit, and Z5 a device located at the guarded structure, at which the testing-circuit is normallyopen and by which it may be closedwhen the test is to be made. With this arrangement when the testing-circuit is closed at Z5 the current of the alarm-battery will pass through the alarmcircuit and the testing-circuit and an indication will be given at the galvanometer. Here also the magnet of the alarm-circuit'is energized, but by reason of the high resistance of the galvanometer an alarm Will not be sounded. These arrangements (shown in Figs. 4 and 5) are open to the objection that 4by connecting the opposite sides of the testing-circuit at a point between the guarded structure and the station by'a medium of high resistance the battery may be exhausted. In ordcrto avoid this, the test may be'made through the Contact J4, at which point the alarm-cirsince it also tests the operativeness of the be separate and nrmally disconnected from the alarm-circuit, as shown in Fig. 4t, and a switching-circuit, with its own individual battery c4, used for connecting the two sides of sides of the alarm-circuit by vmeans of the switch J2, operated by the electromagnet L3, located in the switching-circuit. Here again, asin the form of the invention shown in Figs. 1, 2, and 3, one and the same Wire enters into the construction of both the switching-circuit and the testing-circuit.

In order-to inclose and protect those portions of the several conductors or anyof them which, extend .from the guarded structure to the alarm-station, they are inclosed in a tubular casing or covering which hasv an electrical barrier, `such as shown in Figs. 7, 8, This casing is made up of a plurality of superimposed electrical conductors insulated from leach other and so disposed that if the casingbe penetrated by a metallic instrument the superimposed conductors will be electrically connected, and b ing charged at adjacent points with electricity of different potentials a short circuit willt ereby be pro duced, or it .a rupture of sufi cient size be ductors Will be broken, and inreither case a nected with them will cause an alarm to be i given. This casing or covering is in the 'nature of a conduit or tube, through which a conductor or a number of conductors may may represent an inner tube which is preferably of fabric and is treated with some insulating material. Through this tube may be passed any desired number of electrical conductors, which may or maynot be twisted lor braided together. Preferably they are disposed parallel, since twisting or braidling them will increase the cost and Will not increase the effectiveness of the protection. Upon the outside of this inner insulating-tube is disposed a conductor N. This conductor preferably consists of a strip of tin-foil wound. spirally around the tubedll, or it may consist ofa Wire or a number of wires, and if wires are used they may or may not be woven or plaited or braided together. Around this conductor M is a second tube or layer of insulating matcrialllll, and around this` is a second conductor N', constructed like the first. four of these conductors NN N2N3 are used,

Preferably l .Mi but a greater ora less number may be used, and preferably the separate'convolu- ,tions of each conductor are separated by a space aboutequal to the Width of theconduvctor, and the convolutions of one conductor alternate with theconvolutions of the next. In other words, when the complete casing is'cut longitudinally the exposed ends of the conductors will break joints orbe staggered. Around the Whole is, a sleeve or jacket O, which is insulated from the outerconductor by a sleeve M4 and which is preferably of some flexible ICO TOI.'

material, so that the casing as a whole will be flexible. canvas or lead, the latter being preferred.

W'here a casing or covering of the character above described is used in an electrical burglaralarm 'system/[he several conductors forming its electrical barrier may be incorporated in and used as parts of the system. In Fig. 10, for example, I have shown diagram matically a system in which the conductors N2 and N3 are used in lieu of the conductors C and C, respectively, of the system shown in Figs. l, 2, and 3, While the conductors N and N are in the nature of open circuits Which are laid 4in opposite directions.4 One end ofthe conductor N is connected With one of the conductors of the closed circuit at the alarm-station upon one side ofthe resistance'D, While the conductor N `has one of its endsv connected with one of the conductors of the closed circuit at the guarded structure upon the' other side of the resistance I), so that if electrical connection is made lbetween the conductor N and either of the conductors N' or N2, or between the conductor N- and either of the conductors N or N 3, or between For this outer sleeve I may use i; carnose conductors N2 and the resistance will tort-ein iited and the responsive device `be influenced, causing an alarm to be These several cond uctors forming the electrical barrier ot the casing or covering y so disposed that conductors of different ctentials will fall opposite each other, as

:n clearly in Fig. 0.

n a burglar-alarm system which has conductors other than those of the main or conoiing circuit extending between the alarmtion and rho guarded structure, such as testing and switching circuits, they are disposed within the casing or covering, and the rsin circuit completed through the conductors or some of the conductors forming the barrier of said casing or covering. For example, as shown in Figs.- 7 and Si ilie cond'ictors C and C' bf the main circuit enter o the construction of the electrical harr, while the conductors C" and 6"( ofthe cnitand the conductors L, L', and L2 ci u.ne testing and switching circuits are .disposed Within 'the casing or covering.

l'laving thus described my invention, the following is "what l claim as new therein and desire to secure by Lettersl latent:

l. in an electrical burglar-alarm system, the combination with a nain circuit extending between the guarded structure and an aiarm-staticn and having at the guarded structure two paths orloops, and a responsive "L ce electrically" connected with the main cuit, of antomatically-operating means, protected by the system, Afor establishing one et said paths or loops and means for indicatg toa person upon the outside of the guarded structure whether or not the said path or loop is established, substantially as set'forth.

2. ln an electrical burglar-alarm system, 'the combination with a main circuit extendbetween the guarded structure and an alarm -station and having at the guarded structure two paths or loops, and a responsive device electrically connected with the main circuit, of means, includinga 'part accessible from the outside of the guarded structure,

ladapted for manual operation, for Opening one of said loops, and a single indicator having means for showing the strength of the main current and means for showing the open and closed condition of both loops, substantially as set forth.

3.l in an electrical burglar-alarm system, the combination 'with a main circuit extending between the guarded structure and an alarmstation and having at the guarded structure tivo paths or loops, and a responsive device electrically connected' With the main circuit, of means, including a part accessible lfrom the outside of the guarded structure, for openone of said loops, automatically-operating means protected by the system for establishing said loop, and an indicator adapted to show its condition, substantially as set forth.

ft, ln au electrical burglar-alarm system, the combination `With a main circuit extending between the guarded structure and an alarmstation, and having at the guarded structure two paths or loops, one of which includes the door-contacts and the other of which shunts said contacts, of means for establishing the circuit through the door-contacts, means, including a part accessible from the outside of the guarded structure and adapted for manualoperation, for opening the shunt, and a single indicator electrically connected with the shunt and adapted to indicate the establishing of the door-circuit andthe opening of the shunt, substantially as set forth.

5. In an electrical burglar-alarm system, the combination with a main circuit extending between the guarded structure and an alarmstation and having at the guarded structure a ci reu it,i ncluding the door-contacts and adapt; ed to be electrically connected with the main circuit by the act of closing the door, and a circuit shouting the door-contacts, of autoinatically-operating means protected by the system-.for establishing the shunt, and/means for indicating Whether or not the shunt is established, substantially as set forth.

6. In an electrical burglar-alarm system, the combination with a main circuit extending station and having at the guarded structure -tvvo paths or loops, one of which includes the door-contacts and the other of which shunts said contact s, of means adapted to be operated.

IOC

ren-t onto the shunt, and an indicator electrically connected with the shunt,- substantially as set forth.

7. The combination with an electrical burglar-alarm system of mea-ns for throwing it on and-oli, said means having amovable part carrying means for establishing and breaking the electrical connection, electromagnetic appliances for moving said part and-throwing the system on, said appliances including an electrical circuit and an exposed device for closing it,and a chronometer having means for moving said part and throwing thesystem oli, said movable part andthe means for operating it, except the exposed dev-ice aforesaid, being protected by the system and inaccessible while the system is on, substantially as setforth. p

8. A device for opening and closing acirciiit having, in combination, a1ock-shaft,mer cury-cups carried thereby, 'an armature, an:

said shaft in the opposite direction, substantially as set forth.

IIO

9. In an electrlcal burglar-alarm system,

the combination With a main'circuit extending between the guarded structure and an alarm-station, alarm niechanism'located at the alarm-station and including a battery, and a protected housing inclosing the alarm mechanism, of means located atihe guarded structure and upon the out-side of the protected housings for testing the battery of the alarm mechanism,from the outside of the proA tected housing, means for indica-ting to a person on the outside of the protected housing the result of the test, and meansrfor preventing the giving of an alarm while the test is being made, substantially as set fort-h.

l0. ln an electrical burglar-alarm system, the combination with a main circuit extendthe test, and means for preventing the givingl of an alarm while the test is being made, substantially as set forth.

1l. ln an electrical burglar-alarm system, the combination with a main circuit extending between the guarded structure and an alarm-station, alarm mechanism located at the alarm-station and including an electrical circuitiand a battery, and a protected housing inclosing the alarm mechanism, of a galvanometer located at the guarded structure, means electrically connecting the galvanometer with the circuit of the 'alarm mechanism, whereby said galvauometer is adapted to show the condition of the alarm-battery, and means for preventing the giving of an alarm While f the test is being made, substantially as set forth.

l2. ln anv electrical burglar-alarm system, the combination With a main circuit extend ing between the guarded structure and an alarm-station, alarm mechanism located at the alarmstation and including a circuit and a source of electricity, and a protected housing inclosing said alarm mechanism, of a galvanometer located at the guarded structure and outside of the protected housing, means for electrically connecting the galvanoxneter with the source of electricity of the alarm mechanism, and means for preventing the giving of an alarm while the test is bei-ng' made, substantially as set forth.

13.- In an electrical burglar-alarm system, the combination With a main circuitextending between the guarded structure andan' i ala1m-station,alarm mechanism locatedat the alarm-station and having a source of electricity, and a protected housing inclosing said alarm mechanism, of a galvanometer located at the guarded structure andupon the outside of the protected housing, a normally open circuit including' said galvanometer,l

means located upon the outside of the protected housing for closing said circuit, means for electrically connecting said circuit with the source of electricity of the alarm mechanism, Vand means for preventing the giving of an alarm when the galVanonieter-circuit is closed and connected with the source of electricity ofthe alarm mechanism, substantially as set forth.v

14. In an electrical burglar-alarm system', the combination with a main circuit extending between the guarded structure and au alarm-station, an alarnrcircuit located at the alarm-station and including a battery, and a protected housing inclosing said battery, of a testing-circuit extending from the guarded struct-ure to a point outside thereof and electrically connected with the alarm-circuit` a galvanometer electrically connected with the testing-circuit and located at the alarmsta tion, means for elosin g the tcstingncircutand including therein the batteryof the alarmcircuit, vand means for preventing the giving of an alarm when the testing-circuit is closed, substantially as set forth.

l5. ln au electrical burglar-alarm system, the combination with a main circuit extending between the guarded structure and an alarmstation,alarm mechanism located at the alarm-station and includinga circuit having a batter t and a roteeted housin 7 inclosinc' the alarm mechanism, of a testing-circuit ex: tending from the guarded structure to the alarm-station and electrically connected with the alarm-circuit, a galvano'meter disposed at the guarded structure and electrically con nected with the testing^circuit, means for causing a current to pass through the alarm-V ICO circuit and testing-circuit, and means for preventin g the alarm from operating d urin g the passagg of said current., substantially as set i forth.

16. In anelectrical burglar-alarm system, the combination with a main circuit extending between the guarded' structure and an alarm-station,alarm mechanism located at the alarm-station and including acircuit having a battery, a switch and means holding' the switch normally closed, and a protected housinginclosing said alarm mechanism, of means livr testing the alarm mechanism, means for opening said switch while the test is being made and means located at the guarded structure for indicating to a person upon the outside thereof 'the result of the test, substantially as set forth.

17. In an electrical burglar-alarm system, the combination with a main circuit ezt-tenth ing betweenthe guarded structure and an alarm-station, and an alarm-circuit located at the alarm-station and having a switch and means for holding it normally closed, of an electromagnet for opening said switch, a circuit including it and extending tothe guarded structure, and means for testing the alarm ige g eet/gosse 1P in en eleecrieel 'imrglir-.elerm system,

Lire eombinrrtion with main circuit', extending' iieinveen rlie guarded Structure and an alarm-station, e responsive device located :it elle alermelzetiem and electricallyconnected wiel; the inn-in eirenit, en alarm-circuithaving coni/nere ednpzed to be closed upon :i distnrlffmee of. rire responsive device and including` a, inviten, .fr"Switching-circuit exending from the station to ille gnnrded structure and 'having a nmgnei; arranged in operative relabien to tile switch, a battery common -'no the :nein circuit and switching-circuit,V means for switching' rire current of the lmtery from the :nein circuit to the switching-circuit whereby the elm'mei1euit is closed ab the responsive device sind opened et the switch, and means alarm-station, a responsive device dieposed et the alarm-station and electrically eonneet ed. with the main circuit, an alarm-circuit disposed :it the almm-smtion sind hevingeon mots adapted ,lo be closed by disturbance of the responsive device, e resting-circuit tending from the guarded strncturc and electrically connected with the derni-circuit, a, gelvenometer located et the guarded strueture and electrically connected with the teer,- ing-circuil', a switch in the alarm-circuit, en eleetromagnet disposed in operelive relation thereto, e sy'itchixigreircilib, e betteryeom mon to both the mein circuit and lle switchn ing-circuit, and means located et the guarded etruetu re for switehngthe currentof the betiery from the mein circuit to the switching;-

circnin substantially as set forth.

@Lyme eorLeMAn.

Witnesses:

L. M, Homrms, CROSS. 

